Interpretation of regional gravity and magnetic data in Peninsular Malaysia

In general, the gravity data reflect the regional geology of the area. A gravity maximum of up to 20 mgals, and a broad magnetic minimum wilh ~n amplitude of up to 30 gammas were obtained over the Central Belt. These anomalies may indicate a denser and more basic upper crust underlying the Central Belt. A gravity minimum. with an amplitudeofup to SO mgals. Wllo6 observed over the Main Range. A smaller gravity minimum, with an amplitude or20 to 2S mgals, was also observed over the Eastern Belt granites. These anomalies are probably caused by the granite balholiths in these areas which have lower densities than the surrounding rocks.